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Liquid crystal composition and liquid crystal display device

a liquid crystal composition and display device technology, applied in liquid crystal compositions, chemistry apparatus and processes, thin material processing, etc., can solve the problems of large contrast ratio of the device, short service life of the device, and small electric power consumption

Inactive Publication Date: 2008-01-17
JNC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large dielectric anisotropy of the composition contributes to a low threshold voltage, a small electric power consumption and a large contrast ratio of the device.
The service life of the device is long when the stability is high.

Method used

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  • Liquid crystal composition and liquid crystal display device
  • Liquid crystal composition and liquid crystal display device
  • Liquid crystal composition and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0093]

5-HBB(3F)B-2(1-1)4%5-HBB(3F)B-3(1-1)4%3-H2B(2F,3F)-O2(2-2)10%3-H2B(2F,3F)-O4(2-2)7%5-H2B(2F,3F)-O2(2-2)10%3-HH2B(2F,3F)-O2(2-4)10%4-HH2B(2F,3F)-O2(2-4)9%5-HH2B(2F,3F)-O2(2-4)9%3-HBB(2F,3F)-O2(2-5)6%5-HBB(2F,3F)-O2(2-5)4%3-HH-V(3-1)27%NI = 90.9° C.; Tc ≦−30° C.; Δn = 0.101; Δ∈ = −3.3; η = 23.6 mPa · s; VHR-1 = 99.1%.

[0094]The composition of Example 1 had a negatively large dielectric anisotropy, a low minimum temperature of a nematic phase, a high maximum temperature of a nematic phase and a low viscosity as compared to the composition of Comparative Example 1.

example 2

[0095]

5-HBB(3F)B-2(1-1)6%3-H2B(2F,3F)-O2(2-2)23%5-H2B(2F,3F)-O2(2-2)23%3-HHB(2F,3Cl)-O2 (2-13)3%5-HHB(2F,3Cl)-O2 (2-13)3%3-HBB(2F,3Cl)-O2 (2-17)7%5-HBB(2F,3Cl)-O2 (2-17)3%3-HH-V(3-1)18%3-HH-V1(3-1)8%3-HHEBH-3(—)3%3-HHEBH-5(—)3%NI = 69.9° C.; Tc ≦−20° C.; Δn = 0.092; Δ∈ = −3.1; η = 21.6 mPa · s; VHR-1 = 99.0%.

example 3

[0096]

5-HBB(3F)B-2(1-1)5%3-H2B(2F,3F)-O2(2-2)30%5-H2B(2F,3F)-O2(2-2)30%3-HH-V(3-1)10%3-HH-V1(3-1)5%3-HHEBH-3(—)8%3-HHEBH-4(—)6%3-HHEBH-5(—)6%NI = 72.0° C.; Tc ≦−20° C.; Δn = 0.086; Δ∈ = −3.4; η = 22.2 mPa · s; VHR-1 = 99.1%.

[0097]The composition of Example 3 had a negatively large dielectric anisotropy and a low viscosity as compared to the composition of Comparative Example 1.

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Abstract

A liquid crystal composition having a negative dielectric anisotropy that includes three components, wherein the first component is a specific four-ring compound having phenylene, one hydrogen of which is replaced by fluorine, the second component is a specific compound having phenylene, two hydrogens of which are replaced by fluorine or chlorine, and the third component is a specific compound having two cyclohexylene rings, and a liquid crystal display device including the composition.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority under 35 U.S.C. §119 to Japanese Patent Application No. JP 2006-178971, filed Jun. 29, 2006, which is expressly incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention relates to a liquid crystal composition suitable for use in an active matrix (AM) device, and an AM device containing the composition. In particular, the invention relates to a liquid crystal composition having a negative dielectric anisotropy, and to a device having an IPS (in-plane switching) mode or a VA (vertical alignment) mode containing the composition.[0004]2. Related Art[0005]In a liquid crystal display device, classification based on an operating mode of liquid crystals includes phase change (PC), twisted nematic (TN), super twisted nematic (STN), electrically controlled birefringence (ECB), optically compensated bend (OCB), in-plane switching (IPS), vertical al...

Claims

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Application Information

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IPC IPC(8): C09K19/30
CPCC09K19/3001C09K19/3003C09K19/44C09K2019/123Y10T428/10C09K2019/301C09K2019/3016C09K2019/3025C09K2019/3037C09K2019/3004C09K2323/00
Inventor FUJITA, HIROAKITORII, YUZURUSAITO, MASAYUKI
Owner JNC CORP
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